Then manager Ian Holloway signed a number of players, but that did not work out as planned as Palace struggled at the start of the season.
Tony Pulis replaced Holloway as Palace boss in November, and under him the London club finished 11th in the Premier League.
Palace are expected to reinforce their squad this summer, but Parish has insisted that this time they will take a different approach to the transfer market.
"Last summer wasn't just thrown together," he told the Croydon Advertiser.
"Ian and I and the people we were working with thought about every single player.
"Obviously Ian had a different style to Tony and so he brought in players who brought a different style.
"Some of them may not fit with us going forward but they are good players and the club will do OK out of those players, and those players will do OK having been at Crystal Palace and gaining the experience.
"And in there, there were one or two mistakes, but they weren't mistakes at the time. Some players didn't settle or maybe some didn't see eye-to-eye when they first arrived, for example.
"I am really comfortable with last summer. I think we’ll look at less options this summer because Tony has got a much clearer idea of what he wants."